Exterior surface of a container sidewall



FIG. 1 is a top, rear and right side perspective view of an exterior surface of a container sidewall showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view;

FIG. 4 is a rear elevational view thereof; and,

FIG. 5 is a top plan view thereof.

The neck shown at the top in broken lines is for illustrative purposes only and forms no part of the claimed invention. 

The ornamental design for a exterior surface of a container sidewall, as shown and described. 